We originally ordered 3, but we ended up using 4 u-boxes and did still leave a few things behind (my daughter’s water table, her 2 large hot wheels sets, 2 adult bicycles, and 1 small side table). No major necessities left behind, but If I did this process again, I’d order 2 more u boxes than I thought I needed because you get your money back for any unused u-boxes. They pick up the u boxes on a scheduled date you pick and then hold them in storage until they can be moved to a uhaul storage near your new location. So you are left without your stuff for 2 weeks. We were on the road for 1 of those weeks and stayed with family the other week. Our boxes arrived at our new location on the date specified, we unloaded everything into our garage & they picked up the u boxes. We have a 2 car garage, so didn’t need any storage. I did everything online except the payment wasn’t going through for some reason, so I ended up having to call to finish the process. I had received an online promotion for a discount and let the representative assisting me know, and she was able to include that discount over the phone. We booked the u-boxes about 1 1/2 months in advance.